高三数学数列专题练习及答案
560
12,5,22,11,, (25)
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sin x ,x 2tan = ( )
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2
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b a {}n b n n S .
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n n
a b a
1d
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2
a n b
3*n N 8n b b 1a
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560
13 7 146
151
2122
212n
n n
S 162026
1020 171d n
21111
(
)22,22(2)
2
322
n n n n n n n n a A B a a a a 210121
123(2)2,
3
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n n
b a n S n S n (1)21n n S n
1814224S S 1134
42(2)42
a d a d 1d
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(1)2
n a a n n
11
1172
n n
b a n
1
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7,27,2
3211b b b 4n 41n b b
n b 43b 31b 211n n b a
1111
n b n a 11
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f x x a
1,1a 11,a
11x a 1y 11x a 1y .
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